User Manual

The NeoPixel is connected to pin #40 in Arduino, so just use our NeoPixel library (https://adafru.it/dhw) and set it up as

a single-LED strand on pin 40. In CircuitPython, the NeoPixel is board.NEOPIXEL and the library for it is

here (https://adafru.it/wby) and in the bundle (https://adafru.it/uap). The NeoPixel is powered by the 3.3V power supply

but that hasn't shown to make a big difference in brightness or color. The NeoPixel is also used by the bootloader to

let you know if the device has enumerated correctly (green) or USB failure (red). In CircuitPython, the LED is used to

indicate the runtime status.

The QSPI Flash is connected to 6 pins that are not brought out on the GPIO pads. This way you don't have to worry

about the SPI flash colliding with other devices on the main SPI connection.

QSPI is neat because it allows you to have 4 data in/out lines instead of just SPI's single line in and single line out. This

means that QSPI is

at least

4 times faster. But in reality is at least 10x faster because you can clock the QSPI peripheral

much faster than a plain SPI peripheral

However, the QSPI port is

not

also on an SERCOM. So, you have to either use the QSPI peripheral or bitbang SPI if you

want to talk to the chip. We have an Arduino library here which provides QSPI interfacing for

Arduino (https://adafru.it/BeX). In CircuitPython, the QSPI flash is used natively by the interpretter and is read-only to

user code, instead the Flash just shows up as the writeable disk drive!

Other Pins!